Substances:

• 2 1/4 cups cake flour
• 2 teaspoons baking powder
• 1 teaspoon salt
• 1/2 cup (1 stick) unsalted butter, softened
• Eight oz. cream cheese, softened
• 1 1/three cup sugar
• 1 favorable egg plus 1 favorable egg yolk, room temperature
• 1 1/2 teaspoons vanilla extract

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